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Fair Value of Financial Instruments (Tables) | 12 Months Ended
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Dec. 31, 2018
Fair Value of Financial Instruments [Abstract] |
Fair value of financial assets and liabilities on a recurring basis | The Company's assessment of the significance of a particular input to the fair value measurement requires judgment and may affect the valuation of fair value assets and liabilities and their placement within the fair value hierarchy levels.
(millions of dollars) |  |  |  |  | Fair Value Measurements Using |
|  | Asset / (Liability) Balance at |  |  | Quoted Prices in Active Markets for Identical Assets |  |  | Significant Other Observable Inputs |  |  | Significant Unobservable Inputs |
Description |  | December 31, 2018 |  |  | (Level 1) |  |  | (Level 2) |  |  | (Level 3) |
Deferred compensation plan assets |  | $ | 12.6 |  |  | $ | — |  |  | $ | 12.6 |  |  | $ | — |
Supplementary pension plan assets |  |  | 10.8 |  |  |  | — |  |  |  | 10.8 |  |  |  | — |
Cross currency rate swap |  |  | 3.7 |  |  |  | — |  |  |  | 3.7 |  |  |  | — |
Interest rate swaps |  |  | 0.3 |  |  |  | — |  |  |  | 0.3 |  |  |  | — |
|  |  |  |  | Fair Value Measurements Using |
|  | Asset / (Liability) Balance at |  |  | Quoted Prices in Active Markets for Identical Assets |  |  | Significant Other Observable Inputs |  |  | Significant Unobservable Inputs |
Description |  | December 31, 2017 |  |  | (Level 1) |  |  | (Level 2) |  |  | (Level 3) |
Deferred compensation plan assets |  | $ | 12.9 |  |  | $ | — |  |  | $ | 12.9 |  |  | $ | — |
Supplementary pension plan assets |  |  | 11.6 |  |  |  | — |  |  |  | 11.6 |  |  |  | — |
Interest rate swap |  |  | 2.9 |  |  |  | — |  |  |  | 2.9 |  |  |  | — |
Money market funds |  |  | 0.7 |  |  |  | 0.7 |  |  |  | — |  |  |  | — |

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- Definition Tabular disclosure of assets and liabilities, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, that are measured at fair value on a recurring basis. The disclosures contemplated herein include the fair value measurements at the reporting date by the level within the fair value hierarchy in which the fair value measurements in their entirety fall, segregating fair value measurements using quoted prices in active markets for identical assets (Level 1), significant other observable inputs (Level 2), and significant unobservable inputs (Level 3). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19190-110258 + Details
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